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Jurnal Sains dan Teknologi ReaksiJurnal Sains dan Teknologi Reaksi

This study aims to modify lithium-ion battery separators using a combination of polypropylene (PP), polyurethane (PU), and nano chitosan, and to evaluate the effects of varying composition ratios and soaking time on thickness and thermal stability. The separators were fabricated using the casting method with variations in the PP:PU:Nano Chitosan ratio (4:1:5, 4:2:4, 4:3:3, 4:4:2, and 4:5:1) and soaking times of 1–5 days. Characterization included thickness (Digital Thickness Gauge), thermal stability (thermal shrinkage test and TGA), and surface morphology (SEM). The results showed that a 4:3:3 ratio with 3 days of soaking produced the best performance, with a thickness of 23–25 µm, low thermal shrinkage (0.5%–2.1%), degradation onset at 370.10 °C, degradation peak at 429.73 °C, and a dense and uniform morphology with well-distributed pores. This formulation is recommended as a potential separator for lithium-ion battery applications.

Based on the research results, the optimal ratio for lithium-ion battery separators was found to be 4.Nano Chitosan) with a soaking time of 3 days, achieving a thickness of 23–25 µm and minimal thermal shrinkage.The Thermogravimetric Analysis (TGA) confirmed the good thermal stability of this composition, with degradation onset at 370.10 °C and a peak at 429.The surface morphology analysis revealed an uneven texture with evenly distributed pores, indicating potential for ion diffusion and mechanical strength.

Penelitian lebih lanjut perlu dilakukan untuk menguji kinerja elektrokimia separator yang dihasilkan, termasuk konduktivitas ionik dan kemampuan absorpsi elektrolit, guna validasi langsung dalam sel baterai lithium-ion. Selain itu, studi variasi jenis nano chitosan dengan karakteristik ukuran dan muatan permukaan yang berbeda dapat dilakukan untuk mengoptimalkan dispersi dalam matriks polimer dan meningkatkan sifat mekanik serta termal separator. Terakhir, eksplorasi penambahan aditif lain seperti oksida logam atau karbon nanotubes ke dalam komposisi PP/PU/nano chitosan dapat diinvestigasi untuk meningkatkan konduktivitas ionik, stabilitas elektrokimia, dan kinerja keseluruhan separator baterai, sehingga menghasilkan baterai lithium-ion yang lebih efisien dan tahan lama.

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